We recently learned that AWS IoT now requires SNI. But not really. tl;dr>
Devices connected to AWS IoT currently through MQTT and not using SNI won't be
affected and will keep working with AWS IoT.

https://bifravst.gitbook.io/bifravst/bifravst-on-aws/sni
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Fri, 16 Oct 2020 10:18:56 UTC11